helloworld: example simplification
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Removes unnecessary files, environment variables, copyright messages etc in order to simplify the hello world example. Adds documentation.
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Amends program parameters and removes unnecessary environment variables.
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Amends container image to add entrypoint.
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Renames yadage workflow spec file to match the example name.
Signed-off-by: Tibor Simko tibor.simko@cern.ch